Derivatives and Hedging Activities (Details 1) - Fair Value Hedging [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged item		$ 29
Derivatives designated as hedging instruments		(50)
Total		$ (21)
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged item	$ 115
Derivatives designated as hedging instruments	(95)
Total	$ 20